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Measurement of the production of charm jets tagged with D0 mesons in pp collisions at √s=7 TeV

The production of charm jets in proton-proton collisions at a center-of-mass energy of √s=7 TeV was measured with the ALICE detector at the CERN Large Hadron Collider. The measurement is based on a data sample corresponding to a total integrated luminosity of 6.23 nb−1, collected using a minimum-bias trigger. Charm jets are identified by the presence of a D0 meson among their constituents. The D0 mesons are reconstructed from their hadronic decay D0→K−π+. The D0-meson tagged jets are reconstructed using tracks of charged particles (track-based jets) with the anti-kT algorithm in the jet transverse momentum range pchT, jet<3, 30> GeV/c and pseudorapidity |ηjet| <0.5. The fraction of charged jets containing a D0-meson increases with pchT, jet from 0.042±0.004(stat)±0.006(syst) to 0.080±0.009(stat) ±0.008(syst). The distribution of D0-meson tagged jets as a function of the jet momentum fraction carried by the D0 meson in the direction of the jet axis (zch||) is reported for two ranges of jet transverse momenta, pchT, jet<5, 15> GeV/c and pchT, jet<15, 30> GeV/c in the intervals zch|| <0.2, 1.0> and zch||<0.4, 1.0>, respectively. The data are compared with results from Monte Carlo event generators (PYTHIA 6, PYTHIA 8 and Herwig 7) and with a Next-to-Leading-Order perturbative Quantum Chromodynamics calculation, obtained with the POWHEG method and interfaced with PYTHIA 6 for the generation of the parton shower, fragmentation, hadronisation and underlying event.

jet: charm ; jet: transverse momentum ; pp: scattering ; jet: momentum ; D: hadronic decay ; charged particle: tracks ; parton: showers ; higher-order: 1 ; PYTHIA ; quantum chromodynamics ; underlying event ; CERN LHC Coll ; hadronization ; fragmentation ; rapidity ; HERWIG ; ALICE ; experimental results ; 7000 GeV-cms/nucleon

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